In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo…

Description

In Sudo before 1.8.26, if pwfeedback is enabled in /etc/sudoers, users can trigger a stack-based buffer overflow in the privileged sudo process. (pwfeedback is a default setting in Linux Mint and elementary OS; however, it is NOT the default for upstream and many other packages, and would exist only if enabled by an administrator.) The attacker needs to deliver a long string to the stdin of getln() in tgetpass.c.

Scores

EPSS (exploitation in 30 days)

19.3% · top 2.6% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Weakness

• n/a
• CWE-787 (opens in a new tab)All about CWE-787 and its CVEs

Affected products

• n/a

  • affected n/a

References (26)

• https://support.apple.com/kb/HT210919 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 20200129 APPLE-SA-2020-1-28-2 macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• https://www.sudo.ws/security.html (opens in a new tab)x_refsource_MISCx_transferred
• https://www.sudo.ws/alerts/pwfeedback.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• [oss-security] 20200130 CVE-2019-18634: buffer overflow in sudo when pwfeedback is enabled (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [oss-security] 20200131 Re: CVE-2019-18634: buffer overflow in sudo when pwfeedback is enabled (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 20200131 APPLE-SA-2020-1-28-2 macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
• DSA-4614 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• [debian-lts-announce] 20200201 [SECURITY] [DLA 2094-1] sudo security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 20200203 [slackware-security] sudo (SSA:2020-031-01) (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• 20200203 [SECURITY] [DSA 4614-1] sudo security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• http://packetstormsecurity.com/files/156174/Slackware-Security-Advisory-sudo-Updates.html (opens in a new tab)x_refsource_MISCx_transferred
• http://packetstormsecurity.com/files/156189/Sudo-1.8.25p-Buffer-Overflow.html (opens in a new tab)x_refsource_MISCx_transferred
• [oss-security] 20200205 Re: CVE-2019-18634: buffer overflow in sudo when pwfeedback is enabled (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [oss-security] 20200205 Re: CVE-2019-18634: buffer overflow in sudo when pwfeedback is enabled (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• USN-4263-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• https://security.netapp.com/advisory/ntap-20200210-0001/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• USN-4263-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• RHSA-2020:0487 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2020:0509 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• RHSA-2020:0540 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• openSUSE-SU-2020:0244 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• FEDORA-2020-8b563bc5f4 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• RHSA-2020:0726 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• GLSA-202003-12 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• FEDORA-2020-7c1b270959 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2019-18634](https://trackcve.app/badge/CVE-2019-18634.svg)](https://trackcve.app/cve/CVE-2019-18634)

Record last updated 5 Aug 2024, 01:54 UTC.